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...om the help files of mathematical anotations: "Note that bold, italic and bolditalic do not apply to symbols, and hence not to the Greek symbols such as mu which are displayed in the symbol font. They also do not apply to numeric constants.", it seems that it cannot be done. Thanks, Bingzhang Chen

...package 'vegan' to work on the presence/absence community data. The problem is when two samples are identical (dissimilarity = 0), metaMDS cannot work with zero dissimilarity. I don't want to delete the duplicates as they are true samples from different locations. Thanks in advance. Bingzhang Chen ___________________________________________________________ ????????????????? http://card.mail.cn.yahoo.com/

Dear all, I want to use smooth.spline to construct a cubic smoothing spline and its first derivative to my data. However, the predict.smooth.spline does not seem to provide a SE for both the fitted values and their derivatives. How should I calculate it? Thank you very much, Bingzhang

...uted when requesting too much accuracy: 0 5 The value of t at the time of the last method switch, if any: 0.005314453 So I wonder what are the exact problems with this model. Is it just because of inappropriate parameters? I also wonder how I can speed up the calculation time in R. Thanks, -- Bingzhang Chen Ph. D., State Key Lab of Marine Environmental Science, College of Oceanography and Environmental Science, Xiamen University, Xiamen, Fujian 361005 P. R. China